Java摆动计时器;创建一个循环;数到4两次
使用下面的代码,计时器计数4秒,如果达到1, “你好,世界!”打印出来。Java摆动计时器;创建一个循环;数到4两次,java,swing,loops,timer,count,Java,Swing,Loops,Timer,Count,使用下面的代码,计时器计数4秒,如果达到1, “你好,世界!”打印出来。 如何使计时器计数为4两次并打印 你好,世界只在第一次计数1 我该怎么做 import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.util.Calendar; import java.awt.event.ActionEvent; import java.awt.event.Act
如何使计时器计数为4两次并打印 你好,世界只在第一次计数1 我该怎么做
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Calendar;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import java.awt.Color;
import java.awt.Toolkit;
class clockExample1 extends JFrame {
private JTextField _textfield1;
public clockExample1() {
_textfield1 = new JTextField(5);
_textfield1.setEditable(false);
JPanel panel1 = new JPanel();
panel1.setLayout(new FlowLayout());
panel1.add(_textfield1);
JButton button1 = new JButton("click here");
this.setContentPane(panel1);
this.setTitle("Text Clock 1");
this.pack();
this.setLocationRelativeTo(null);
this.setResizable(true);
panel1.add(button1);
ClockListener cl = new ClockListener();
Timer t = new Timer(1000, cl);
t.start();
}
class ClockListener implements ActionListener {
int count = 0;
public void actionPerformed(ActionEvent e) {
int fakeSecond = (count++ % 4) + 1;
if (fakeSecond == 1) { System.out.println( "Hello, World!" );
}
Calendar now = Calendar.getInstance();
int h = now.get(Calendar.HOUR_OF_DAY);
int m = now.get(Calendar.MINUTE);
int s = now.get(Calendar.SECOND);
_textfield1.setText("" + fakeSecond + "");
}
}
public static void main(String[] args) {
JFrame clock = new clockExample1();
clock.setVisible(true);
}
}
这是您想要的演示程序:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Timer;
public class TestCls {
static int i=1;
static Timer timer;
static boolean flag = false;
public static void main(String[] args) throws InterruptedException {
timer = new Timer(100, new ActionListener() {
public void actionPerformed(ActionEvent evt) {
if (i == 4){
if(!flag){
System.out.println("Print me on 4.");
i=0;
flag = true;
} else {
timer.stop();
}
}
i = i + 1;
}
});
timer.start();
Thread.sleep(1000);
}
}
这是您想要的演示程序:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Timer;
public class TestCls {
static int i=1;
static Timer timer;
static boolean flag = false;
public static void main(String[] args) throws InterruptedException {
timer = new Timer(100, new ActionListener() {
public void actionPerformed(ActionEvent evt) {
if (i == 4){
if(!flag){
System.out.println("Print me on 4.");
i=0;
flag = true;
} else {
timer.stop();
}
}
i = i + 1;
}
});
timer.start();
Thread.sleep(1000);
}
}
这就是您需要放入ClockListener的代码
//in timer
if(counter == 1)
System.out.println( "Hello, World!" );
else if(counter == 8)
t.stop();
祝你好运,波罗。这就是你需要放入时钟侦听器的代码
//in timer
if(counter == 1)
System.out.println( "Hello, World!" );
else if(counter == 8)
t.stop();
祝你好运,波罗。只要做一个AlertnativeCounter,就像我在下面所做的那样
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Calendar;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import java.awt.Color;
import java.awt.Toolkit;
class clockExample1 extends JFrame {
private JTextField _textfield1;
public clockExample1() {
System.out.println("Flow Here"+"2");
_textfield1 = new JTextField(5);
_textfield1.setEditable(false);
JPanel panel1 = new JPanel();
panel1.setLayout(new FlowLayout());
panel1.add(_textfield1);
JButton button1 = new JButton("click here");
this.setContentPane(panel1);
this.setTitle("Text Clock 1");
this.pack();
this.setLocationRelativeTo(null);
this.setResizable(true);
panel1.add(button1);
System.out.println("Flow Here"+"3");
ClockListener cl = new ClockListener();
Timer t = new Timer(1000, cl);
t.start();
}
class ClockListener implements ActionListener {
int count = 0, alternativecounter=0;
public void actionPerformed(ActionEvent e) {
System.out.println("Flow Here"+"4");
int fakeSecond = (count++ % 4) + 1;
if (fakeSecond == 1) {
alternativecounter+=1;
System.out.println("alternativecounter"+alternativecounter);
if(alternativecounter==2)
{
alternativecounter=0;
System.out.println("alternativecounter"+alternativecounter);
JOptionPane.showMessageDialog(null,"Warm Welcome to you, My dear friend");
}
}
System.out.println("Flow Here"+"5");
Calendar now = Calendar.getInstance();
int h = now.get(Calendar.HOUR_OF_DAY);
int m = now.get(Calendar.MINUTE);
int s = now.get(Calendar.SECOND);
_textfield1.setText("" + fakeSecond + "");
}
}
public static void main(String[] args) {
System.out.println("Flow Here"+"1");
JFrame clock = new clockExample1();
clock.setVisible(true);
}
}
只要有一个AletNativeCounter,就像我在下面所做的那样
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Calendar;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import java.awt.Color;
import java.awt.Toolkit;
class clockExample1 extends JFrame {
private JTextField _textfield1;
public clockExample1() {
System.out.println("Flow Here"+"2");
_textfield1 = new JTextField(5);
_textfield1.setEditable(false);
JPanel panel1 = new JPanel();
panel1.setLayout(new FlowLayout());
panel1.add(_textfield1);
JButton button1 = new JButton("click here");
this.setContentPane(panel1);
this.setTitle("Text Clock 1");
this.pack();
this.setLocationRelativeTo(null);
this.setResizable(true);
panel1.add(button1);
System.out.println("Flow Here"+"3");
ClockListener cl = new ClockListener();
Timer t = new Timer(1000, cl);
t.start();
}
class ClockListener implements ActionListener {
int count = 0, alternativecounter=0;
public void actionPerformed(ActionEvent e) {
System.out.println("Flow Here"+"4");
int fakeSecond = (count++ % 4) + 1;
if (fakeSecond == 1) {
alternativecounter+=1;
System.out.println("alternativecounter"+alternativecounter);
if(alternativecounter==2)
{
alternativecounter=0;
System.out.println("alternativecounter"+alternativecounter);
JOptionPane.showMessageDialog(null,"Warm Welcome to you, My dear friend");
}
}
System.out.println("Flow Here"+"5");
Calendar now = Calendar.getInstance();
int h = now.get(Calendar.HOUR_OF_DAY);
int m = now.get(Calendar.MINUTE);
int s = now.get(Calendar.SECOND);
_textfield1.setText("" + fakeSecond + "");
}
}
public static void main(String[] args) {
System.out.println("Flow Here"+"1");
JFrame clock = new clockExample1();
clock.setVisible(true);
}
}
你不是忘了把这个标记为家庭作业吗;-)你说的简单是什么意思?哈哈,我是初学者!定时器是你自己的对象吗?我不认为java.util.Timer有一个名为start的方法?您是否忘记将其标记为家庭作业;-)你说的简单是什么意思?哈哈,我是初学者!定时器是你自己的对象吗?我不认为java.util.Timer有一个名为start的方法?非常感谢Sankar,这正是我的意思!非常感谢你,桑卡,这正是我的意思!